Question 1143482
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If x miles per hour is his average jogging speed, then his average walking speed is {{{(1/2)x}}}  miles per hour.


The "time" equation is

    {{{9/x}}} + {{{1.5/((1/2)*x)}}} = 2  hours,

or, equivalently,

    {{{9/x}}} + {{{3/x}}} = 2  hours,



To solve it, multiply both sides by x. You will get


    9 + 3 = 2x.

    12     = 2x

    x      = 12/2 = 6 miles per hour.


<U>ANSWER</U>.  His average jogging speed is  6 miles per hour.


<U>CHECK</U>.   {{{9/6}}} + {{{1.5/3}}} = 1.5 + 0.5 = 2 hours.   ! Correct !
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Solved.